Genetic Dissection of Light-Regulated Adventitious Root Induction in Arabidopsis thaliana Hypocotyls

Photomorphogenic responses of etiolated seedlings include the inhibition of hypocotyl elongation and opening of the apical hook. In addition, dark-grown seedlings respond to light by the formation of adventitious roots (AR) on the hypocotyl. How light signaling controls adventitious rooting is less well understood. Hereto, we analyzed adventitious rooting under different light conditions in wild type and photomorphogenesis mutants in Arabidopsis thaliana. Etiolation was not essential for AR formation but raised the competence to form AR under white and blue light. The blue light receptors CRY1 and PHOT1/PHOT2 are key elements contributing to the induction of AR formation in response to light. Furthermore, etiolation-controlled competence for AR formation depended on the COP9 signalosome, E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC (COP1), the COP1 interacting SUPPRESSOR OF PHYA-105 (SPA) kinase family members (SPA1,2 and 3) and Phytochrome-Interacting Factors (PIF). In contrast, ELONGATED HYPOCOTYL5 (HY5), suppressed AR formation. These findings provide a genetic framework that explains the high and low AR competence of Arabidopsis thaliana hypocotyls that were treated with dark, and light, respectively. We propose that light-induced auxin signal dissipation generates a transient auxin maximum that explains AR induction by a dark to light switch.     

蒙古族“普斯.贺”称谓考证及造型探究

目的 “普斯.贺”是蒙古族人民使用最为频繁的一种纹样,然而对“普斯.贺”的研究却是凤毛麟角,且人们对其认知较为模糊,梳理“普斯.贺”这一称谓的历史时间线,印证其来源,明晰其造型,解析其文化内涵,为传承并创新蒙古族传统纹样提供设计参考。方法 建立在个案研究、田野调查法与文献分析法的基础上,通过对附着于蒙古族衣、食、住、行上的“普斯.贺”进行系统考证。选取典型样本进行分类、编码,从图案学和类型学角度出发,提取纹样的造型轮廓、构成方式并进行归纳分析。结论 “普斯.贺”这一称谓自清代就已开始使用,一直延续至今,其造型来源于汉字“寿”,通过纺织品等载体传入蒙古族,因其自身具有的结构、内涵与蒙古族的审美意蕴高度契合,承载着人们对家庭圆满和生命永生的精神诉求,成为蒙古族物质载体中不可或缺的重要装饰纹样之一。通过本研究,以期更好地传承蒙古族传统纹样,为非物质文化的研究提供一定的理论参考与补充。     

钛合金的扩散焊连接技术

本文介绍了扩散焊的原理、特点和主要扩散焊方法,对其在钛合金材料中的应用研究现状进行了综述,并对钛合金扩散连接的应用前景进行了展望。     

冷历史对PA1010及其共混物内耗行为的影响

本工作对尼龙1010(PA1010)及其与双酚A型聚碳酸酯(PC)的共混物进行了内耗测量,发现它们的内耗峰温与测量起始温度有密切联系。     

Editable Supercapacitors with Customizable Stretchability Based on Mechanically Strengthened Ultralong MnO2 Nanowire Composite

Although some progress has been made on stretchable supercapacitors, traditional stretchable supercapacitors fabricated by predesigning structured electrodes for device assembling still lack the device‐level editability and programmability. To adapt to wearable electronics with arbitrary configurations, it is highly desirable to develop editable supercapacitors that can be directly transferred into desirable shapes and stretchability. In this work, editable supercapacitors for customizable shapes and stretchability using electrodes based on mechanically strengthened ultralong MnO₂ nanowire composites are developed. A supercapacitor edited with honeycomb‐like structure shows a specific capacitance of 227.2 mF cm^?2 and can be stretched up to 500% without degradation of electrochemical performance, which is superior to most of the state‐of‐the‐art stretchable supercapacitors. In addition, it maintains nearly 98% of the initial capacitance after 10 000 stretch‐and‐release cycles under 400% tensile strain. As a representative of concept for system integration, the editable supercapacitors are integrated with a strain sensor, and the system exhibits a stable sensing performance even under arm swing. Being highly stretchable, easily programmable, as well as connectable in series and parallel, an editable supercapacitor with customizable stretchability is promising to produce stylish energy storage devices to power various portable, stretchable, and wearable devices.